Humongous bumpage
Quote:
640x480 is optimal in most cases, but if you can go as low as 320x200, do so.
I kinda disagree. The edges of weapons and textures may look jaggy if ripped at 320x200 (raw rip, no resizing), if the game has no antialiasing. You should rip at 640x480 and resize it ONCE to 320x200, using bicubic, bilinear or smart resizing (under no circtumstances should you use "pixel resizing"!) which should 'soften' your gun to a nicer look.
Oh, another rule. To get rid of antialising you should either place your weapon on a new layer over a black background, and then merge the image and fill the black with cyan, though it may leave slight black outlines (which looks bad). The best method is to, well, remove AA over outlines of your gun by hand. To keep an eye of them fill the cyan background with a less saturated colour, like grey or brown, and it'll make green/blue buggers pop out so you can erase them.